Finding the Fourth Proportional to 21,932.78, 32,890.59 and 7,138.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,932.78 : 32,890.59 = 7,138.10 : x
2. Step 2: Convert to fraction form
   21,932.78/32,890.59 = 7,138.10/x
3. Step 3: Cross multiply
   21,932.78x = 32,890.59 × 7,138.10
4. Step 4: Simplify right side
   21,932.78x = 234,776,320.48
5. Step 5: Solve for x
   x = 234,776,320.48/21,932.78
6. Step 6: Final answer
   x = 10,704.36